New York City's residential building stock spans 150 years of construction history, and the type of building you live in fundamentally affects what renovation is possible, what approvals are required, and which contractors have relevant experience. Here's a guide to the major building types.
Pre-War Buildings (Before 1940)
The most architecturally distinctive residential buildings in NYC — typically 6 to 20 stories, with original architectural details (crown molding, plaster medallions, hardwood floors, elaborate trim), solid masonry or steel frame construction, and original plaster wall systems. Renovation considerations: lead paint testing required before any disturbance; original plaster is fragile and requires specialist handling; co-op boards in pre-war buildings tend to be among the most demanding; alteration agreements often specify requirements for plumbing and electrical work that reflect the building's age.
Post-War Co-ops (1945 to 1975)
The dominant residential building type in outer-borough NYC and much of Manhattan above 96th Street — typically 6 to 25 story brick construction with minimal architectural detail, standard-issue construction, and drywall or early plaster-and-lath wall systems. More permissive alteration agreements than pre-war buildings in many cases. Standard renovation approach applies. Many of these buildings are now in significant renovation cycles as original systems (plumbing, electrical) age out.
New Development (Post-2000)
Contemporary condominium construction in glass-and-steel towers concentrated in Midtown South, Downtown Manhattan, Long Island City, and Downtown Brooklyn. Modern systems, higher construction standards, and typically condo rather than co-op ownership (which simplifies approval requirements). Finishes are often basic developer-grade and ripe for upgrade. Wall systems are drywall; no lead paint concerns; renovation is more straightforward logistically but may still require board notification.
Brownstones and Townhouses
Single- or multi-family row houses, typically three to five stories, brick or brownstone construction, concentrated in Brooklyn (Park Slope, Cobble Hill, Brooklyn Heights, Fort Greene) and Manhattan (West Village, Upper West Side, Harlem). Often individually owned or owner-occupied with rental units. Greatest renovation flexibility — no co-op board, typically no condo board. Historic district designation may restrict exterior changes. Lead paint is extremely common. Original plaster and original hardwood floors are standard.